root / org.gvsig.toolbox / trunk / org.gvsig.toolbox / org.gvsig.toolbox.algorithm / src / main / java / es / unex / sextante / vectorize / contourLines / ContourLinesAlgorithm.java @ 59
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package es.unex.sextante.vectorize.contourLines; |
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import java.util.ArrayList; |
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import com.vividsolutions.jts.geom.Coordinate; |
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import com.vividsolutions.jts.geom.Geometry; |
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import com.vividsolutions.jts.geom.GeometryFactory; |
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import es.unex.sextante.additionalInfo.AdditionalInfoNumericalValue; |
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import es.unex.sextante.core.GeoAlgorithm; |
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import es.unex.sextante.core.Sextante; |
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import es.unex.sextante.dataObjects.IRasterLayer; |
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import es.unex.sextante.dataObjects.IVectorLayer; |
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import es.unex.sextante.exceptions.RepeatedParameterNameException; |
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import es.unex.sextante.outputs.OutputVectorLayer; |
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public class ContourLinesAlgorithm |
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extends
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GeoAlgorithm {
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public static final String LAYER = "LAYER"; |
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public static final String DISTANCE = "DISTANCE"; |
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public static final String MIN = "MIN"; |
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public static final String MAX = "MAX"; |
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public static final String RESULT = "RESULT"; |
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private IRasterLayer m_Window;
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private IVectorLayer m_Contour;
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private char[][] m_Row; |
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private char[][] m_Col; |
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private final GeometryFactory m_GF = new GeometryFactory(); |
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@Override
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public void defineCharacteristics() { |
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setName(Sextante.getText("Contour_lines"));
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setGroup(Sextante.getText("Vectorization"));
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setUserCanDefineAnalysisExtent(false);
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try {
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m_Parameters.addInputRasterLayer(LAYER, Sextante.getText("Input_layer"), true); |
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m_Parameters.addNumericalValue(DISTANCE, Sextante.getText("Equidistance"),
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AdditionalInfoNumericalValue.NUMERICAL_VALUE_DOUBLE, 100, 0, Double.MAX_VALUE); |
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m_Parameters.addNumericalValue(MIN, Sextante.getText("Min_value"), 0, |
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AdditionalInfoNumericalValue.NUMERICAL_VALUE_DOUBLE); |
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m_Parameters.addNumericalValue(MAX, Sextante.getText("Max_value"), 10000., |
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AdditionalInfoNumericalValue.NUMERICAL_VALUE_DOUBLE); |
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addOutputVectorLayer(RESULT, Sextante.getText("Contour_lines"), OutputVectorLayer.SHAPE_TYPE_LINE);
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} |
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catch (final RepeatedParameterNameException e) { |
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Sextante.addErrorToLog(e); |
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} |
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} |
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@Override
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public boolean processAlgorithm() { |
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double dMin, dMax;
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double dDistance;
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final String sFields[] = new String[2]; |
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final Class types[] = { Integer.class, Double.class }; |
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try {
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m_Window = m_Parameters.getParameterValueAsRasterLayer(LAYER); |
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dMin = m_Parameters.getParameterValueAsDouble(MIN); |
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dMax = m_Parameters.getParameterValueAsDouble(MAX); |
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dDistance = m_Parameters.getParameterValueAsDouble(DISTANCE); |
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m_Window.setFullExtent(); |
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if ((dMin <= dMax) && (dDistance > 0)) { |
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if (dMin < m_Window.getMinValue()) {
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dMin += dDistance * (int) ((m_Window.getMinValue() - dMin) / dDistance);
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} |
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if (dMax > m_Window.getMaxValue()) {
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dMax = m_Window.getMaxValue(); |
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} |
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sFields[0] = "ID"; |
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sFields[1] = "Elevation"; |
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m_Contour = getNewVectorLayer(RESULT, Sextante.getText("Contour_lines"), IVectorLayer.SHAPE_TYPE_LINE, types, sFields);
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createContours(dMin, dMax, dDistance); |
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return !m_Task.isCanceled();
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} |
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return false; |
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} |
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catch (final Exception e) { |
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Sextante.addErrorToLog(e); |
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return false; |
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} |
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} |
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private void createContours(final double dMin, |
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final double dMax, |
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double dDistance) {
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int x, y;
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int i;
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int ID;
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int iNX, iNY;
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double dZ;
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double dValue = 0; |
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iNX = m_Window.getNX(); |
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iNY = m_Window.getNY(); |
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m_Row = new char[iNY][iNX]; |
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m_Col = new char[iNY][iNX]; |
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if (dDistance <= 0) { |
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dDistance = 1;
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} |
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for (dZ = dMin, ID = 0; (dZ <= dMax) && setProgress((int) (dZ - dMin), (int) (dMax - dMin)); dZ += dDistance) { |
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for (y = 0; y < iNY - 1; y++) { |
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for (x = 0; x < iNX - 1; x++) { |
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dValue = m_Window.getCellValueAsDouble(x, y); |
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if (dValue >= dZ) {
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m_Row[y][x] = (char) (m_Window.getCellValueAsDouble(x + 1, y) < dZ ? 1 : 0); |
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m_Col[y][x] = (char) (m_Window.getCellValueAsDouble(x, y + 1) < dZ ? 1 : 0); |
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} |
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else {
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m_Row[y][x] = (char) (m_Window.getCellValueAsDouble(x + 1, y) >= dZ ? 1 : 0); |
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m_Col[y][x] = (char) (m_Window.getCellValueAsDouble(x, y + 1) >= dZ ? 1 : 0); |
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} |
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} |
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} |
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for (y = 0; y < iNY - 1; y++) { |
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for (x = 0; x < iNX - 1; x++) { |
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if (m_Row[y][x] != 0) { |
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for (i = 0; i < 2; i++) { |
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findContour(x, y, dZ, true, ID++);
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} |
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m_Row[y][x] = 0;
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} |
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if (m_Col[y][x] != 0) { |
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for (i = 0; i < 2; i++) { |
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findContour(x, y, dZ, false, ID++);
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} |
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m_Col[y][x] = 0;
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} |
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} |
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} |
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} |
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} |
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private void findContour(final int x, |
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final int y, |
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final double z, |
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final boolean doRow, |
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final int ID) { |
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boolean doContinue = true; |
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final boolean bIsFirstPoint = true; |
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int zx = doRow ? x + 1 : x; |
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int zy = doRow ? y : y + 1; |
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double d;
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double xPos, yPos;
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final double xMin = m_Window.getWindowGridExtent().getXMin(); |
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final double yMax = m_Window.getWindowGridExtent().getYMax(); |
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Geometry line; |
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final Object values[] = new Object[2]; |
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final NextContourInfo info = new NextContourInfo(); |
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final ArrayList<Coordinate> coords = new ArrayList<Coordinate>(); |
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info.x = x; |
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info.y = y; |
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info.iDir = 0;
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info.doRow = doRow; |
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do {
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d = m_Window.getCellValueAsDouble(info.x, info.y); |
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d = (d - z) / (d - m_Window.getCellValueAsDouble(zx, zy)); |
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xPos = xMin + m_Window.getWindowCellSize() * (info.x + d * (zx - info.x) + 0.5);
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yPos = yMax - m_Window.getWindowCellSize() * (info.y + d * (zy - info.y) + 0.5);
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coords.add(new Coordinate(xPos, yPos));
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if (!findNextContour(info)) {
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doContinue = findNextContour(info); |
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} |
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info.iDir = (info.iDir + 5) % 8; |
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if (info.doRow) {
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m_Row[info.y][info.x] = 0;
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zx = info.x + 1;
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zy = info.y; |
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} |
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else {
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m_Col[info.y][info.x] = 0;
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zx = info.x; |
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zy = info.y + 1;
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} |
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} |
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while (doContinue);
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values[0] = new Integer(ID); |
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values[1] = new Double(z); |
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final Coordinate[] coordinates = new Coordinate[coords.size()]; |
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for (int i = 0; i < coordinates.length; i++) { |
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coordinates[i] = coords.get(i); |
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} |
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if (coordinates.length > 1) { |
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line = m_GF.createLineString(coordinates); |
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m_Contour.addFeature(line, values); |
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} |
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} |
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private boolean findNextContour(final NextContourInfo info) { |
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boolean doContinue;
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if (info.doRow) {
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switch (info.iDir) {
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case 0: |
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if (m_Row[info.y + 1][info.x] != 0) { |
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info.y++; |
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info.iDir = 0;
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doContinue = true;
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break;
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} |
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case 1: |
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if (m_Col[info.y][info.x + 1] != 0) { |
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info.x++; |
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info.iDir = 1;
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info.doRow = false;
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doContinue = true;
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break;
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} |
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case 2: |
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case 3: |
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if (info.y - 1 >= 0) { |
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if (m_Col[info.y - 1][info.x + 1] != 0) { |
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info.x++; |
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info.y--; |
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info.doRow = false;
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info.iDir = 3;
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doContinue = true;
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break;
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} |
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} |
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case 4: |
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if (info.y - 1 >= 0) { |
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if (m_Row[info.y - 1][info.x] != 0) { |
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info.y--; |
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info.iDir = 4;
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doContinue = true;
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break;
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} |
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} |
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case 5: |
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if (info.y - 1 >= 0) { |
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if (m_Col[info.y - 1][info.x] != 0) { |
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info.y--; |
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info.doRow = false;
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info.iDir = 5;
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doContinue = true;
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break;
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} |
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} |
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case 6: |
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case 7: |
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if (m_Col[info.y][info.x] != 0) { |
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info.doRow = false;
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info.iDir = 7;
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doContinue = true;
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break;
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} |
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default:
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info.iDir = 0;
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doContinue = false;
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} |
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} |
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else {
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switch (info.iDir) {
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case 0: |
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case 1: |
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if (m_Row[info.y + 1][info.x] != 0) { |
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info.y++; |
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info.doRow = true;
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info.iDir = 1;
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doContinue = true;
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break;
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} |
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case 2: |
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if (m_Col[info.y][info.x + 1] != 0) { |
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info.x++; |
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info.iDir = 2;
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doContinue = true;
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break;
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} |
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case 3: |
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if (m_Row[info.y][info.x] != 0) { |
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info.doRow = true;
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info.iDir = 3;
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doContinue = true;
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break;
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} |
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case 4: |
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case 5: |
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if (info.x - 1 >= 0) { |
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if (m_Row[info.y][info.x - 1] != 0) { |
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info.x--; |
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info.doRow = true;
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info.iDir = 5;
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doContinue = true;
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break;
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} |
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} |
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case 6: |
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if (info.x - 1 >= 0) { |
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if (m_Col[info.y][info.x - 1] != 0) { |
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info.x--; |
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info.iDir = 6;
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doContinue = true;
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break;
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} |
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} |
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case 7: |
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if (info.x - 1 >= 0) { |
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if (m_Row[info.y + 1][info.x - 1] != 0) { |
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info.x--; |
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info.y++; |
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info.doRow = true;
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info.iDir = 7;
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doContinue = true;
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break;
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} |
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} |
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default:
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info.iDir = 0;
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doContinue = false;
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} |
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} |
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return (doContinue);
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} |
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private class NextContourInfo { |
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public int iDir; |
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public int x; |
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public int y; |
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public boolean doRow; |
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} |
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} |